These are pre-construction brackets for MartinLogan Helos in-ceiling speakers designed for use in new construction, to be attached to studs before drywall is installed. The use of these brackets assures that installers are able to pre-wire and rough-in the location of the speakers, so that after the dry wall installation, holes of the appropriate size are left open.

Rough-in brackets are available in two sizes. Use the 11-inch Model 6100 for MartinLogan Helos 100 in-ceiling speakers; use the 8.375-inch Model 61020 for MartinLogan Helos 20 and Helos 10 in-ceiling speakers.